Answer: True
Explanation:
<u>A cell membrane consists of a lipid bilayer made of polar phosphate head and a nonpolar lipid tail.</u> It is semipermeable and regulates the transport of materials through it. For this,<u> it is selectively permeable</u> and since it is made of lipids, hydrophobic and small polar molecules can diffuse easily through it by simple diffusion and down their concentration gradient. However, polar molecules, large molecules (such as glucose) and ions are not able to pass through it because they are repelled.
To accomplish the transport of these molecules that can not diffuse, proteins embebbed in the membrane function as carriers that enable the transport of polar molecules, large molecules and ions by passive (through facilitated diffusion, down its concentration gradient) or active transport (movement against its concentration gradient).
Answer: D) Yeast is a facultative anaerobe, meaning it can use oxygen for respiration, but then switch to anaerobic respiration when O2 is not present, undergoing fermentation, producing alcohol as a byproduct.
Explanation:
Gene interaction is the determination of a single trait or phenotype by genes at more than one locus; the effect of one gene on a particular trait depends on the effects of a different gene located else where in the genome. One type of gene is epistasis. One of the difference between the epistatic gene and hypostatic gene is that the alleles at the epistatic gene mask or repress the effects of alleles at another gene. Hypostatic gene on the other hand is the whose alleles are masked or repressed.