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5 Cards in this Set

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A geneticist crosses two rabbits, both of which have brown fur. In rabbits, brown fur is dominant over white fur. Six of the eight offspring produced have brown fur, and the other two have white coats. The genotypes of the parents were most likely which of the following?

A) Bb X Bb
B) BB X Bb
A) Bb X Bb
The ratio of brown-furred rabbits to white-furred rabbits was 3:1, and this means that we can deduce that the genotypes of the offspring were BB, Bb, Bb, and bb. By doing a Punnett square, you can find the correct combination of alleles to produce a offspring in that ratio is Bb X Bb.
A biologist isolates an organism from a pond and describes it in his lab notebook as having both a larval and an adult stage, air-breathing lungs, the digestive system of a carnivore, eggs that lack shells, and camouflage epidermis that secretes toxins, and as exhibiting external fertilization. This organism is probably which of the following?

A) A frog
B) A salamander
A) A frog
The organism that this biologist isolated is a frog, which is part of the class Amphibia and the order Anura. Frogs can secrete poison from their skin glands to prevent themselves from being eaten by predators, and they display all of the other characteristics listed. They lay eggs in moist environments, and although they have lungs, they rely also on their moist skin as a site of gas exchange.
Which of the following is an example of simple diffusion across a membrane?

A) The movement of H+ across the thylakoid membrane during photosynthesis
B) The movement of oxygen in the alveoli across the epithelial membrane and into the bloodstream
B) The movement of oxygen in the alveoli across the epithelial membrane and into the bloodstream
The movement of oxygen from the clusters of alveoli at the tips of the bronchioles in the lung, across the epithelial walls, and into the bloodstream is an example of passive diffusion. Carbon dioxide moves from the bloodstream back into the lungs, to be expelled during exhalation in the same way--through diffusion.

(A) is an example of active transport.
Which of the following correctly represents the order of the tissues through which water and minerals will pass on their way up from a plant's roots?

A) Root hair, epidermis, cortex, endodermis (Casparian strip), stele

B) Root hair, epidermis, stele, cortex, endodermis (Casparian strip)
A) Root hair, epidermis, cortex, endodermis (Casparian strip), stele
The order of tissues through which water and select minerals will pass as they travel from the roots to the xylem (then to be transported through the entire plant) is as follows: into the root hair cell, through the epidermis, through the cortex, through the endodermis (where the Casparian strip filters out unwanted substances), and then into the stele (which contains the xylem vessels).
Which of the following evolved before algae?

A) Protists

B) Bacteria
B) Bacteria
Bacteria are the only living organisms among the two answers to evolve before algae; bacteria are prokaryotes, whereas algae are eukaryotic. The earliest eukaryotes were single-celled algae, and they thought to have evolved about a half billion years after the prokaryotes