The pores through which leaves exchange atmospheric gases with leaf cells during photosynthesis are the
A. sieve tube elements.
B. guard cells.
C. stomata.
D. epidermal cells.
E. petioles.
C. stomata.
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Among the vascular plants, single-veined leaves are characteristic of the ____
Fill in the blank with the appropriate word.
Hemoglobin is a(n) -rich protein that carries oxygen.
A. calcium B. potassium C. zinc D. phosphorous E. iron
Seriously abnormal phenotypes or harmful mutations are acted against or reduced to low frequencies by which
mechanism? a. gene flow b. genetic drift c. natural selection d. disruptive selection e. beneficial mutations
What is a triglyceride?
A) a lipid made of two glycerols, a fatty acid, and a phosphate group B) a lipid made of one glycerol and three fatty acids C) a polypeptide made of three amino acids D) a carbohydrate made of three sugars E) a lipid made of one glycerol and two fatty acids