In DNA replication, a primer is
a. what the original DNA strands are called.
b. an enzyme that breaks the hydrogen bonds
between base pairs.
c. a short piece of nucleic acid that ‘jump
starts’ the replication process.
d. a molecule that provides the energy for
nucleotide attachments.
e. a regulatory protein that turns on the gene
that starts DNA replication
C
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Which of the following is a correct matching of the researcher with their discovery?
A. Pauling provided information on primary structure in biological molecules. B. Franklin suggested that DNA was a helix with more than one strand and that there were about 10 bases per turn of the DNA C. Watson and Crick collected a large amount of X-ray data on the structure of DNA. D. Chargaff demonstrated that the adenine and cytosine bases and the uracil and guanine bases interacted in some manner.
The route followed by a sperm from production to fertilization in a flowering plant is:
A. A pollen grain is produced in the anther, transported to a stigma where it produces two sperm cells that pass through a pollen tube that grows down the style to the ovary. One of the sperm cells enters the ovule and joins with the egg cell. B. A pollen grain is produced in the pistil, which explosively ejects it into the air where it is transported to a stigma where it forms two sperm cells. One of the sperm cells passes through a pollen tube that grows down the style to the ovary, enters the ovule and joins with the egg cell. C. A sperm cell, enclosed in a pollen grain with another sperm, is produced in the filament, transported to a stigma where it passes through a pollen tube that grows down the style to the ovary, enters the ovule and joins with the egg cell. D. A sperm cell, enclosed in a pollen grain with another sperm, is produced in the anther, transported to the pedicel where it passes through a pollen tube that grows down the style to the ovary, enters the ovule and joins with the egg cell. E. A sperm cell is produced in the anther, transported to a stigma where it becomes enclosed along with another sperm cell into a pollen grain that grows down the style to the ovary, enters the ovule and joins with the egg cell.
Members of the same species living in the same area and interacting are:
a. a community. b. a population. c. an ecosystem. d. a biosphere. e. a biome.
Which of the following facts did Hershey and Chase make use of in trying to determine whether DNA or protein is the genetic material?
a) DNA contains phosphorus, whereas protein does not b) DNA contains nitrogen, whereas protein does not c) DNA contains purines, whereas protein includes pyrimidines d) DNA contains sulfur, whereas protein does not