Guard cells control the opening and closing of plant stomata by creating osmotic gradients across their membranes, which are adjusted by regulating the concentration of ________ in their cytoplasm
Fill in the blank(s) with correct word
potassium ions
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Testosterone has important regulatory functions in humans and many other animals. Molecules with regulatory
functions like testosterone are called ____.
a. phytosterols b. enzymes c. lipoproteins d. hormones e. receptors
Imprinting affects the phenotype when
A) both alleles of a gene are imprinted. B) both alleles of a gene are inactivated or deleted. C) one allele is imprinted and the other is inactivated or deleted. D) an embryo arises from two female genomes or two male genomes.
Apes walk on their feet and knuckles. The apes with opposable thumbs have opposable toes.
Answer the following statement true (T) or false (F)
Cattle egrets follow African ungulates such as African buffalo around and catch insects that the buffalo flush out. Oxpeckers perch on the backs of buffalo and feed on ectoparasites that infest the buffalo. Which one of the following shows the ecological interaction that the buffalo has with each bird?
A. cattle egret: commensalism; oxpecker: mutualism B. cattle egret: commensalism; oxpecker: commensalism C. cattle egret: mutualism; oxpecker: mutualism D. cattle egret: competition; oxpecker: mutualism E. cattle egret: mutualism; oxpecker: commensalism