The morphology of plants is determined
A. by cell division at the tip of the shoots and cell elongation at the tip of the roots.
B. by cell division at the tip of the roots and cell elongation at the tip of the shoots.
C. by cell elongation at both the tip of the shoots and the roots.
D. by cell death (apoptosis) along the radial axis.
E. by cell division at both the tip of the shoots and the roots.
E. by cell division at both the tip of the shoots and the roots.
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Which of the following macromolecules leaves the nucleus of a eukaryotic cell through pores in the nuclear membrane?
A) DNA B) amino acids C) mRNA D) phospholipids
Which of the following is not soluble in water?
A) lipids B) sugars C) amino acids D) disaccharides E) nucleic acids
Which of the following is a true statement about glycogen?
a. Glycogen is made and stored in the liver and muscle. b. Glycogen is a long-term energy storage molecule. c. Glycogen helps cell membranes stay flexible. d. Glycogen is a precursor of steroid hormones.
Dogs and pigs are members of different species because
A. one is a predator, and the other is prey. B. hybrids between them are infertile. C. they are at the far end of the ring in a ring species. D. of prezygotic barriers to their ability to breed. E. of postzygotic barriers to their ability to breed.