Cell Biology Answers

Lysosomes are known as “suicidal bags” because

Parasitic activity

Presence of food vacuole

Hydrolytic activity

Catalytic activity

certain protein can only act as a catalyst if it is linked with the B vitamin biotin. This protein is called and biotin is its

Membranes are essential components of all cells. 

• Briefly describe the structure of a eukaryotic plasma membrane, identifying at least two component macromolecules and describing what their basic function is within the membrane.

 The plasma membrane protects the integrity of the interior of the cell by allowing certain substances in, while keeping other substances out.

• Summarize the manner in which small molecules are permitted to pass through the membrane ensuring you explain the difference between passive, facilitated, active, and coupled transport by comparing and contrasting them.
• Finally, explain the difference between endocytosis and exocytosis and provide an example of a molecule (remembering to state its function) that is transferred using this method.

In order for the enzyme lactase to catalyze the digestion of lactose into the monosaccharides glucose and galactose,lactose must first bind to the ___________ of the enzyme

based on where they perform gheir functions the enzymes amylase and maltase in human saliva are classified as

A given DNA helix is 50 bp long. If there are 12 adenine molecules in this segment, how many guanine bases are present in this molecule?

The Newcastle Hare also has a single gene responsible for ear erectness. The allele E is dominant and produces a protein resulting in an erect pointy ear, while the recessive form (e) results in the lack of this protein and drooping ears. If a droopy eared, hissing male mates with a female who is heterozygous for both traits, answer the following questions:

i. What is the probability that any offspring will have droopy ears? (Blank 1)

ii. What is the probability that any offspring will be both droopy eared and hissing? (Blank 2)

iii. What is the probability that any offspring will be erect eared screamers?

iv. What are all the possible genotypes for the progeny (list them)?

Zucchini has three autosomal genes that exist on three separate homologous pairs of chromosomes. Each is completely dominant over its recessive form. Here they are:

A = curly shape    B = green color      D = spotted

a = straight shape    b = yellow color      d = unspotted

* Figure out the probability of progeny with curly, yellow, spotted zucchinis arising from the cross of parents with the following genotypes:

   AaBbDd X AAbbDd      Probability = _____________

Why have humans evolved to be taller over the last three hundred years?

Which of the following is NOT an important molecule in the food that we eat?

carbohydrates

Lipids

carbón dioxide

Protein