What type of sensory receptors create the
action potential that we ultimately perceive as
sound?
a. chemoreceptors
b. mechanoreceptors
c. proprioreceptors
d. photoreceptors
e. more than one of these
B
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How many replication forks are there at a replication origin?
A. 1 B. 2 C. 3 D. 4 E. 5
As a fish forces water across its gill, the blood flowing through the gill
a. picks up O2 over the whole route of exchange. b. picks up O2 during the first half of the exchange path, then equilibrates. c. picks up O2 over the second half of the exchange route only. d. removes O2 from the gill and then releases most of its O2 back to the gill. e. releases O2 over the whole route of exchange.
Answer the following statements true (T) or false (F)
1. The pattern of embryonic expression for a specific gene shown by RNA in situ hybridization and a GFP fusion protein will always be identical. 2. Site-specific recombination systems, such as Flp recombinase/FRT sites, can function only in a single species. 3. A barrier element between a gene and heterochromatin would prevent that gene from being transcriptionally silenced by heterochromatin spreading. 4. Kinetochores include motor proteins that exert pulling forces on spindle microtubules. 5. Both Spo11 and Cas9 are enzymes that create double-strand breaks in DNA.
The skin cells of an adult female rat has 40 autosomes and 2 sex chromosomes. A healthy egg cell would contain which number and type of chromosomes?
A. 20 autosomes and 1 X chromosome B. 20 autosomes and 1 Y chromosome C. 40 autosomes and 2 X chromosomes D. 40 autosomes and 2 Y chromosomes