Freezing oocytes has not been as successful as freezing sperm because
A) they undergo an extra meiosis.
B) the woman can become dangerously cold.
C) ice crystals can form in the abundant, watery cytoplasm.
D) the nuclei shatter.
C) ice crystals can form in the abundant, watery cytoplasm.
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In gene regulation and control, induction can be defined as the:
a. mechanism of genetic control in which genes are induced only when the substrate to be degraded by enzymatic action is present. b. uptake of free DNA from the environment and recombination with the recipient's homologous DNA. c. mechanism of genetic control in which genes are not transcribed and therefore are not expressed in the presence of those target products in sufficient supply. d. change of the bacterial genotypes through the exchange of DNA from one cell to another.
How many fossil species have been collected?
a. 500,000 b. 125,000 c. 250,000 d. 100,000 e. 1.2 million
The density of cold water at great depths is
a. lower than surface waters. b. similar to the surface waters. c. higher than the surface waters. d. always the same throughout the water column. e. variable, depending on latitude.
You are viewing a sputum smear that has been stained with an acid-fast stain. On this smear you see 5 um long pink rod-shaped bacteria. You can conclude that:
A.These are gram- normal microbiota B. There are no acid-fast bacilli seen in this specimen C. These are acid-fast normal microbiota D. There are acid-fast bacilli in this specimen