Answer the following questions true (T) or false (F)
1. Microscopic algae and bacteria produce over half of the oxygen in the atmosphere.
2. The core of some viruses is carbohydrate in nature.
3. Scientists do not consider viruses to be alive because viruses cannot metabolize outside a host cell.
1. TRUE
2. FALSE
3. TRUE
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Which of the following is not a feature of yeast artificial chromosomes (YACs) and YAC vectors?
A. CEN sequences for stability and proper segregation B. selectable markers in each arm to ensure their presence in the final construct C. yeast origin of replication D. a circular form in the yeast cell E. TEL sequences for stability and proper segregation
The cytoplasmic membrane of both eukaryotes and prokaryotes functions to
A. form endoplasmic reticulum. B. produce energy. C. regulate movement of molecules that enter and leave the cell. D. form lysosomes and Golgi apparatus.
Stomata are opened when ____ guard cells and they become ____
a. active transport pumps H+ into; turgid b. active transport of H+ stops in; flaccid c. active transport pumps H+ out of; turgid d. active transport pumps H+ into; flaccid e. active transport of H+ stops in; turgid
In alcohol fermentation, NAD+ is regenerated from NADH during the
A) reduction of acetaldehyde to ethanol (ethyl alcohol). B) oxidation of pyruvate to acetyl CoA. C) reduction of pyruvate to form lactate. D) oxidation of NAD+ in the citric acid cycle. E) phosphorylation of ADP to form ATP.