Which of the following statements concerning centrioles is FALSE?
a. They are present in most animal cells but not most plant cells.
b. They are duplicated before cell division.
c. They have a 9 + 2 arrangement of microtubules.
d. They are found in the centrosome.
e. They are thought to play a role in microtubule assembly.
C
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What happens when an impulse reaches the end of an axon that is attached to skeletal muscle?
What will be an ideal response?
Which phrase describes proteobacteria?
a. They are Gram-positive and include the purple bacteria. b. They are Gram-negative and include the green bacteria. c. They are Gram-negative and include the purple bacteria. d. They are Gram-positive and include the green bacteria.
In the fruit fly Drosophila, there is a dominant gene for normal wings and its recessive allele for vestigial wings. At another gene locus on the same chromosome, there is a dominant gene for red eyes and its recessive allele for purple eyes. A male that was heterozygous at both gene loci was mated with a female that was homozygous for both recessive alleles and the following results were observed among the offspring:Normal wings and red eyes - 420Vestigial wings and red eyes - 80Normal wings and purple eyes - 70Vestigial wings and purple eyes - 430According to these data, what is the distance, in centimorgans, between these 2 gene loci? (Enter the number only without the units. For example, 100 cM would be entered as 100)
Fill in the blank(s) with the appropriate word(s).
What percentage of the population carries Staphylococcus aureus in their nose?
A) 1-2 % B) 10-15 % C) 25-30 %