Biology

Front 1

If the structural genes of the lac operon are producing unless corepressed to turn off, then, we can infer that system is a/an

Back 1

A repressible system

Front 2

Transcript processing control and transport control are two different ways that gene expression in prokaryotes and eukaryotes is controlled. On which of the following molecules is the control exerted

Back 2

mRNA

Front 3

At what level is control being exerted when a protein has been made but is inactive because key ingredients are absent from its structure

Back 3

Posttranslation

Front 4

Activator proteins in Eukaryotic cells and repressor proteins in prokaryotic cells regulate gene expression by controlling

Back 4

transcription

Front 5

Second messenger hormones systems exert their control on cellular activity by

Back 5

signaling cAMP productive which then activates a whole series of events within a target cell

Front 6

Which of the following is a fatty acid hormone that has been implicated as the causative agent of headaches, menstrual cramps and is also responsible for the contractions experienced in parturition

Back 6

Prostaglandin

Front 7

The two types of chemicals that are most often used to control gene expression in Eukaryotes are

Back 7

Hormones and nonhiston acidic proteins

Front 8

Which of the following genes in the lactose operon system does not transcribe an mRNA thus it makes no protein

Back 8

Operator gene

Front 9

Operator genes

Back 9

may have all of the above functions

Front 10

In the lac operon if the repressor protein that is made can immediately shut the system off when it is produced, then we can assume than that system is a/an

Back 10

inducible system

Front 11

With the exception of visual and olfactory inputs, all other sensory inputs to the brain must enter the brain via

Back 11

myencephalon

Front 12

In the regulation of blood sugar, these pancreatic islet cells detect an increase in the levels of glucose in the blood and initiate glucose removal and deposition in muscle and liver cells

Back 12

Beta cells

Front 13

One small group of mammals is fundamentally different from all other mammals because they lay eggs and also secrete milk. The mammals belong to the group called

Back 13

monotremes

Front 14

If a developing fetus is to become a male, which of the following hormones must be present to direct development of the reproductive structures?

Back 14

Testosterone and Mullerian inhibiting hormone

Front 15

Which of the following compounds belongs to the amine category of hormones?

Back 15

epinephrine

Front 16

If progesterone levels remain high at the end of the luteal phase of a woman's monthly cycle, a logical conclusion is

Back 16

she is pregnant

Front 17

A patient is a diagnosed as having Diabetes insipidus, a condition that results from damage to the posterior pituitary. One of the symptoms is a constant, excessive formation of dilute. Which of the following hormones would be affected by damage to the posterior pituitary?

Back 17

ADH

Front 18

An analgesic is a substance that reduces pain. Which of the following are pain suppressors manufactured by the brain cells?

Back 18

endorphins

Front 19

Select the hormone pair with permissive effects

Back 19

estrogen and progesterone

Front 20

If an animal is said to be ovoviviparous, it means that that individual

Back 20

lays a shelled egg that hatches internally, releasing a live larva

Front 21

Ovulation occurs in response to increase levels of

Back 21

luteinizing hormone

Front 22

In the development of a human fetus, the first trimester is characterize by the process of

Back 22

development and morphogenesis

Front 23

Select the hormone pair with antagonistic effects

Back 23

calcitonin and parathyroid hormone

Front 24

Which of the two hormones regulates water balance?

Back 24

ADH/Aldosterone

Front 25

Atrophy (loss) of the corpus luteum accompanied by a delay in the normal functioning of the placenta of a human will result in

Back 25

a miscarriage (spontanious abortion)

Front 26

Pheromones differ from all other hormones that we have studied because they

Back 26

leave the body via duct, travel in air, and stimulate a target cell in another organism some distance away

Front 27

In which of the vertebrate brain would one look to find the Pineal organ and what hormone would you expect to extract from it?

Back 27

diencephalon; melatonin

Front 28

Select the hormone pair that is essential for survival

Back 28

parathyroid hormone and aldosterone

Front 29

Which of the following is not a function of molecular messengers?

Back 29

Initiating DNA synthesis and repair

Front 30

Certain pancreatic islels cells can shut off both insulin and glucagon production by producing somatostatin which allows digestion and absorption of glucose to occur in cells. These cells are called

Back 30

Delta Cells

Front 31

Which of the following sequences represents the neural pathway of a somatic relex arc in a burn prevention reflex?

Back 31

thermoreceptor- dorsal root ganglia - motor neuron - muscle

Front 32

Degeneration of the myelin sheath of the axons of the brain and spinal cord results in the disease called

Back 32

multiple sclerosis

Front 33

Select the hormone pair that acts synergistically

Back 33

aldosterone and antidiuretic hormone

Front 34

If the number of IPSP outnumber the number of EPSP impulses on a postsynaptic neuron that neuron would become

Back 34

Hyperpolarized

Front 35

The cell body of this division of the autonomic nervous system is located in the cranial and sacral region of the spinal column

Back 35

parasympathetic

Front 36

The sense of smell is controlled by the part of the brain known as the

Back 36

telencephalon

Front 37

These cells, located in the artery wall sense an increase in CO2 levels in the blood and send a message to the brain which in turn causes the intercoastal muscles in the ribcage to contract, expelling air. The cells are called

Back 37

carotid bodies

Front 38

Destruction of the cell bodies of somatic motor neurons that innervate (connects to) skeletal muscle results in a type of paralysis called

Back 38

polio

Front 39

Schwann cells, specialized supportive glial cells, extend along an axon like fatty sausages on a string, providing protection, insulation and transmission junctions. The cells collectively are called the

Back 39

myelin sheath

Front 40

Myasthenia gravis, a neuromuscular disease, results in weak and fatigued muscles, and is caused by a lack of which of the following synaptic neurotransmitters

Back 40

acetylcholine

Front 41

Neural intergration means that

Back 41

all excitatory and inhibitory signals are summed in a postsynaptic neuron prior to a response.

Front 42

In humans, melatonin controls gonadal activity prior to puberty by repressing secretion of

Back 42

GnRH by the hypothalamus

Front 43

In humans, the SRY region of a chromosome stimulates undifferentiated embryonic sexual tissues to become

Back 43

testes and vas efferens and vas deferens

Front 44

Which of the following psychoactive drugs has not been recognized as an approved drug for medicinal purposes?

Back 44

Nicotine

Front 45

Neuromodulators in our nervous system

Back 45

magnify, enhance or reduce the effects of neurotransmitters

Front 46

In a calico cat, the allele for coat color, black or yellow, is carried on the X chromosome. Only one of the X-chromosomes in each cell is active and not necessarily the same X in each cell. Therefore, genes on only one of the x-chromosomes are expressed: The inactive X chromosome is called a _____ and balances in the gene expression between males and females which is called ____

Back 46

Barr body: dosage compensation

Front 47

The effects of sympathetic fibers of the autonomic nervous system

Back 47

are generally opposite to those of parasympathetic fibers

Front 48

A sex-linked disorder which results in loss of the myelin sheath in skeletal muscles results in

Back 48

muscular dystrophy

Front 49

The metencephalon and the myencephalon, two parts of the brain that coordinate muscular activity, are derived from the embryonic region of the brain called the

Back 49

Rhombencephalon

Front 50

Which of the following receptors are responsible for sensing pressure, including the duration of pressure, due to mechanical stimulation

Back 50

Meissner's corpuscles/ Merkel's cells