Which elements are required by all cells in the largest amounts?
a. nitrogen, sulfur, iron, and phosphorus
b. phosphorus, oxygen, sulfur, and carbon
c. carbon, oxygen, hydrogen, and nitrogen
d. magnesium, hydrogen, nitrogen, and, iron
Answer: B
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How do scientists determine the annealing temperature used in PCR reactions?
a. It is always 55?C because the DNA polymerase works best at this temperature. b. It is always 55?C because primers anneal best at lower temperatures. c. It is always 60?C because any other temperature would destabilize the DNA. d. It can vary from 55-60?C depending on the primers being used. e. It can vary from 55-60?C depending on the type of DNA polymerase being used.
Which of the following is the best explanation for the presence of both chloroplasts and mitochondria in plant cells?
a, in the light, plants are photosynthetic autotrophs. In the dark, they are heterotrophs. b. if plants cannot produce enough ATP in the process of photosynthese to meet their energy needs, they can produce it in aerobic respiration c. sugars are produced in chloroplasts. these sugars can be stored in the plant for later use, converted to other chemicals, or broken down in aerobic respiration to yield ATP for the plant to use to meet its energy needs d. the leaves and sometimes the stems of plants contain chloroplasts which produce APT to meet the energy needs of these plant parts. The roots of plants contain mitochondria which produce ATP to meet the energy of these plant parts.
The driving force that pushes the root tip through the soil is primarily _____
A) continuous cell division in the root cap at the tip of the root B) continuous cell division just behind the root cap in the center of the apical meristem C) elongation of cells behind the root apical meristem D) continuous cell division of root cap cells
According to the above figure, which letter corresponds to the area where most, if not all, amino acids are reabsorbed?
A. A B. B C. C D. D E. E