A plant should still be able to reproduce sexually
even though its __________ have been removed.
a. stamens
b. sepals
c. anthers
d. ovaries
e. carpels
Answer: b
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In pea plants, flowers are either white or purple; the purple color is produced by pigments called anthocyanins. The production of anthocyanins is a two-step process; the first is controlled by the C gene and the second by the P gene
Both genes must produce functional proteins for anthocyanin to be produced. For each gene, the dominant (C and P) alleles produce functional proteins. You cross two pea plants, each with the genotype CcPp. What proportion of their offspring will have white flowers? A. 13/16 B. 9/16 C. 7/16 D. 3/4 E. 1/4
Which of the following is a physiological mechanism used by endotherms to dissipate heat?
a. basking b. contact with hot surfaces, such as rocks c. vasodilation d. group activities that generate heat
Analysis of the phylogeny of flu viruses reveals that the two 1968 strains (see the accompanying figures) both carry neuraminidase N2, but their hemagglutinins are distantly related (H2 and H3)
Moreover, before the global pandemic of 1968, human flu viruses had never carried H3. This observation suggests that ________. A) H3 was acquired from a nonhuman strain which, in turn, allowed the virus to infect humans on a global scale B) flu strains, when present together in the same host cell, can trade genes C) the 1968 human flu strain acquired its H3 gen from a bird virus D) All of these conclusions are supported by this data.
Which statement regarding exercise is true?
A) Most of the ATP for aerobic exercise comes from aerobic respiration. B) During a short burst of activity such as a sprint, the main source of energy is aerobic respiration. C) If the demand for ATP outstrips oxygen supply, muscles switch to aerobic fermentation.