23. Which of the following hormones exhibits both positive and negative feedback controls on hormone release from the hypothalamus?
(A) Follicle-stimulating hormone (FSH)
(B) Luteinizing hormone (LH)
(C) Estradiol
(D) Progesterone
(E) Testosterone

24. In the homeostatic regulation of mammalian acid-base balance, central and peripheral monitors detect fluctuations in the partial pressure of CO₂ and the concentration of H⁺ ions. Which of the following best categorizes the specialized sensory receptors located in the carotid bodies and the medulla oblongata responsible for this task? (A) Baroreceptors (B) Nociceptors (C) Thermoreceptors (D) Chemoreceptors (E) Proprioceptors

25. Which of the following experimental designs would provide the most robust evidence for the hypothesis that high-intensity ultrasound from bats serves as a specific trigger to inhibit moth flight? (A) Electrophysiological recording of moth motor neurons while mechanically stimulating the wing muscles. (B) Field observation of wild moths using high-speed infrared cameras while broadcasting ultrasonic pulses at frequencies and decibels mimicking hunting bats. (C) Qualitative observation of bat-moth interactions in a cave system to determine the percentage of successful strikes. (D) Laboratory trials comparing moth flight patterns when exposed to three-dimensional physical models of predators versus non-predatory insects. (E) Statistical analysis of moth population densities in regions with varying bat activity to correlate survival with flight cessation habits.

1. Which of the following best describes how an individual with genotype AaBbCCDdEE can make gametes with eight different genotypes. (A) mutations during meiosis form new alleles that are incorporated into the gametes (B) crossing over during prophase I leads to increased genetic diversity (C) the inheritance of a particular copy of one chromosome does not affect the inheritance of a different chromosome (D) dominant alleles tend to be inherited together

2. The following phylogeny shows six living species (a-f) and five ancestral (now extinct) species (1-5). If the phylogeny had been developed on the basis of similarities in bone structure, which of the following predictions would you make in terms of the structure of a particular enzyme? (A) The enzymes of species b and f are very similar. (B) The enzymes of species b and c are more similar to ancestor 4 than to ancestor 2. (C) The enzymes of species a and b are the same as that of ancestor 2. (D) The enzyme of species c is very similar to that of species d.

3. Carolus Linnaeus believed that species remained fixed in the form in which they had been created. Which of the following concepts are inconsistent with Linnaeus's model of classification? (A) a hierarchical classification scheme (B) taxonomy (C) phylogenies (D) nested, increasingly inclusive categories of organisms

4. Which of the following plant structures most directly produces the pollen tube of angiosperms? (A) male gametophyte (B) female gametophyte (C) male sporophyte (D) female sporophyte

5. The chloroplasts of land plants are thought to have been derived according to which evolutionary sequence? (A) cyanobacteria → green algae → land plants (B) cyanobacteria → green algae → fungi → land plants (C) red algae → brown algae → green algae → land plants (D) cyanobacteria → red algae → green algae → land plants

6. An animal cell that lacks carbohydrates on the external surface of its plasma membrane would likely be impaired in which of the following functions? (A) transporting ions against an electrochemical gradient (B) cell-cell recognition (C) attaching the plasma membrane to the cytoskeleton (D) establishing a diffusion barrier to charged molecules

7. Poliovirus is an RNA virus of the picornavirus group, which uses its RNA as mRNA. The RNA genome has a 5' RNA cap instead of a 5' methyl-G cap. This is followed by a non-translated leader sequence and then a single long protein-coding region (~7,000 nucleotides) followed by a poly-A tail. Infected cells were incubated with radioactive amino acids and viral proteins were isolated. After a short incubation with radioactive amino acids only very long viral proteins were seen, while longer periods of labeling result in several short polypeptides of different lengths. Which of the following conclusions is most consistent with the results described? (A) Host cell ribosomes translate the viral coding region and poly-A tail at different times resulting in the different populations of proteins. (B) The RNA is first translated into a single long protein, which is then cleaved into shorter ones. (C) The RNA is translated into short polypeptides, which are then assembled into large complexes. (D) The large radioactive polypeptides are coded by the host, whereas the short ones are coded by the virus.

8. Testosterone is an example of a chemical signal that affects, variously, the very cells that synthesize it in the testis, the neighboring cells, and distant cells outside the gonads. Thus, testosterone is an example of _______. (A) a neurohormone signal, a neuroendocrine signal, and an exocrine product (B) a paracrine signal, a synaptic signal, and an exocrine product (C) an autocrine signal, a neuroendocrine signal, and a synaptic signal (D) an autocrine signal, a paracrine signal, and an endocrine signal

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