Pseudocoelomate nematodes lack a body cavity.
A. Incorrect; their body cavity is fully enclosed by ectoderm but is a functional body cavity.
B. Correct; they are solid from the gut to the cuticle.
C. Incorrect; although not fully enclosed by mesoderm the pseudocoel is a body cavity.
D. Correct; their pseudocoel does not allow for the development and expansion of organs.
Answer: C
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How does the simple primary and secondary structure of DNA hold the information needed to code for the many features of multicellular organisms?
A) The hydrogen bonding among backbone constituents carries coded information. B) The base sequence of DNA carries the information needed to code for proteins. C) The width of the double helix changes at each gene due to differences in hydrogen bonds. D) The amino acids that make up the DNA molecule contain the information needed to make cellular proteins.
When we say that DNA replication is semiconservative, we mean that:
A. only half of an organism's DNA is replicated during each cell division. B. when DNA is replicated, each new double helix contains one parental strand and one newly synthesized daughter strand. C. when DNA is replicated, one double helix contains both parental strands and one contains two newly synthesized daughter strands. D. parental DNA stays in the parent cell and daughter DNA ends up in the daughter cell. E. None of the answer options are correct.
An ion is an atom that has
A. a net negative charge. B. a different number of neutrons from the number of protons. C. a net negative or positive charge, with the number of electrons different from the number of protons. D. the same number of electrons as it does protons. E. a net positive charge. Accessibility: Keyboard Navigation
Which of the following species was once considered so benign that microbiologists used it to trace movements of air currents in hospitals and over cities?
What will be an ideal response?