Which of the following statements is correct regarding chromosomes?
A) Chromosomes are strands of DNA, tightly wrapped up, that are located everywhere in the cell.
B) Chromosomes are strands of RNA, tightly wrapped up, that are in the cytoplasm.
C) Chromosomes are strands of DNA, tightly wrapped up, that are located in the nucleus.
D) Chromosomes are strands of RNA, loosely wrapped up, that are located everywhere in the cell.
C
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Which of the following statements about the palolo worm is FALSE?
a. Its scientific name is Eunice viridis. b. It is a polychaete annelid. c. It lives in coral reefs. d. It produces gamete-filled tails in its anterior end. e. Its tails break off once a year, in October.
The ________ in sperm whales is thought to play a part in the whale's echolocation system
a. rostrum b. ambergris c. spermaceti d. melon
The way that genetic material of a bacteriophage enters a bacterium is most like the way that
A) a drug is injected with a hypodermic needle. B) a person swallows a pill. C) skin lotion is rubbed onto the hands. D) water soaks into a sponge.
An unknown element is found to contain 45 protons and an atomic mass of 64, what is its atomic number?
A. It cannot be determined. B. 19 C. 45 D. 64