In which of the stages below are the chromosomes present as attached sister chromatids? I. metaphase II. telophase III. prophase IV. anaphase
a. III and IV
b. I, III, and IV
c. I and III
d. I, II, and III
e. I, II, III, and IV
c
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Matching II. Choose the one most appropriate
answer for each. 1. ___ control over enzyme activity 2. ___ transcript processing 3. ___ post-translational control 4. ___ transcriptional control 5. ___ transport control A. influences the amount and kinds of mRNA assembled from structural genes B. snipping out of transcript regions; chemical modification of transcript before it arrives at ribosome control C. nuclear envelope selectively regulates passage of transcripts D. phosphorylation of translated protein E. for example, the interior environmental pH determines whether a protein can act as a cell catalyst
The type of floral attraction that would work on the pollinator in Figure 37-2 is:
a. white flowers. b. purple or blue flowers. c. a strong sweet scent. d. a strong carrion-like scent. e. sweet nectar.
Which of the following is a sex-linked recessive condition?
A) Albinism B) Down syndrome C) Cystic fibrosis D) Sickle-cell anemia E) Hemophilia
Which of the following statements best reflects the nature of synaptic plasticity?
(a) New synapses are created due to the postnatal generation of neurons. (b) Synaptic response changes in magnitude depending on frequency of stimulation. (c) There is a change in the type of neurotransmitter used at the synapse. (d) Neuronal connections are pruned during normal development.