The plasma membrane
A. is composed of an extracellular and intracellular layer of phospholipids.
B. has extracellular and intracellular layers or leaflets that are highly symmetrical.
C. uses cholesterol as its primary lipid.
D. contains cellulose.
A. is composed of an extracellular and intracellular layer of phospholipids.
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Xanthophyll pigments __________
A. prevent formation of reactive oxygen species B. absorb light energy C. convert light energy into heat D. reflect yellow light E. All answer options are correct.
Answer the following statements true (T) or false (F)
1. Phylogenetic analyses of some vertebrate mineralcorticoid and glucocorticoid receptors and their ligands has suggested that the hormones evolved prior to their receptors. 2. Vasotocin is present in non-mammalian vertebrates and shares structural and functional properties with mammalian antidiuretic hormone and oxytocin. Through these similarities it has been suggested that vasotocin could be the ancestral precursor to the posterior pituitary hormone in vertebrates. 3. Vitamin D is a hormone produced in part by exposure to sunlight. 4. If blood sodium levels rise sharply above normal limits the heart will release more atrial natriuretic peptide.
Epigenetic effects cause _____ behavior without altering _____
a. instinctive; oxytocin level b. instinctive; the genome c. conditioned; the genome d. heritable changes in; DNA sequence e. temporary changes in; RNA sequence
The accompanying figure represents Lack's hypothesis on clutch size. According to this hypothetical data, ________
A) the probability of survival for individual nestlings decreases linearly with each successive increase in the clutch size B) the probability of survival for individual nestlings increases, then decreases with each successive increase in the clutch size C) the optimal clutch size in terms of survival rates is intermediate D) A and C are both true. E) All of the above are true.