List the layers of the gastrointestinal tract wall, starting with the outer layer and moving inward.
What will be an ideal response?
The outermost layer is the serosa layer, which is the visceral peritoneum.
The next layer is the muscularis, which consists of two layers of smooth muscle.
The third layer is the submucosa, which is a broad band of loose connective tissue that contains nerves, blood, and lymphatic vessels.
The innermost layer is the mucosa.
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Which of the following is true of electric synapses? Select all correct choices
A. They enable rapid communication. B. They are found in the mammalian brain. C. They release neurotransmitter molecules through exocytosis.
In rats, the P gene allele for pigmentation (P) is dominant to the allele for albinism (p). The B gene allele for black pigmentation (B) is dominant to the allele for cream pigmentation (b). The pp homozygous recessive genotype is epistatic to any allele combination at gene B. Predict the phenotypic ratio of the F2 progeny of a parental cross between a pure-breeding black rat and an albino that is also homozygous for cream.
A) 1 black: 2 cream: 1 albino B) 9 black: 3 cream: 4 albino C) 9 black: 7 albino D) 12 black: 3 cream: 1 albino E) 15 black: 1 albino
You are examining a rigid plant tissue; it does not flex or bend. Tests show that it is not consuming oxygen gas, as would be expected if aerobic respiration were occurring. This tissue is probably
A) collenchyma. B) phloem. C) epidermis. D) sclerenchyma. E) parenchyma.
How much of your DNA is identical to the person who sits next to you in biology class?
A. 1% B. 50% C. 90% D. 99.9% E. 99%