Which structure holds homologous chromosomes tightly together and supports them as they undergo recombination?
a. kinetochore
b. centromere
c. microtubules
d. spermatozoa
e. synaptonemal complex
ANSWER: e
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How is binary fission similar to mitosis with cytokinesis?
A. Both are modes of sexual reproduction. B. Both occur only in eukaryotes. C. Both occur only in prokaryotes. D. Both involve replication of DNA and separation of DNA equally into two daughter cells. E. Both give rise to offspring that are genetically different from the parent.
What regulates blood flow through a capillary bed?
a. arteriole flow b. venule flow c. heart rate d. precapillary sphincter status e. amount of salt in the blood
The chromosome of a bacterial cell possesses the following genotype with regard to the lac operon: I?O+Z+Y?A?. This bacterial cell would
A) make ?-galactosidase in the presence of lactose. B) make ?-galactosidase independently of lactose. C) make ?-galactosidase and galactoside permease in the presence of lactose. D) make transacetylase in the presence of lactose. E) make no lac gene products.
You live at the base of a mountain where there is a tropical forest. As you travel up the mountain you would expect
A. the kinds of plants and animals to be similar at the base and top of the mountain. B. the forest will change into a grassland. C. to see organisms similar to those found in more northerly climates. D. to find desert.