Biology chapter 3

If the temperature should drop to 30 degrees overnight, which individual would stand a better chance of survival? An individual whose cell membrane was made up of phospholipids with saturated fatty acid tails or phospholipids with unsaturated fatty acid tails. Explain your response.

An individual whose cell membrane was made up of phospholipids with unsaturated fatty acid tails. Because saturated links up faster making it easier to freeze up. Unsaturated will remain liquid longer.

Is there a change in the number of chromosomes when cell division starts? Provide evidence to support your response.

Chromosomes number does not change. Two diploid daughter cells are produced with the same chromosome number.

Which of the following would you expect to be prominent in osteoclasts? Why?

Golgi apparatus. They synthesis lipids and package them up to form lysosomes

In what form are nutrients once they enter the cell- monomer or polymer? How did they get into this state?

Monomers. They got into this state by hydrolysis

What cell structure would allow the composition of the intracellular fluid to be different than the extracellular fluid? Why might this be important?

Plasma Membrane. This makes it semi-permeable.

Infer which ribosomes would be responsible for making the microfilaments found in the cell. Explain your response.

actin and myosin. microfilaments are often found achored to proteins in the cell

Is the following statement true or false? All cells have the same number of organelles? Support your response.

human cells have more organelles than bacteria cells. Bacteria doesn't have organelles.

The triplet code in DNA for the amino acid histidine is G-T-A. Predict the mRNA codon for this amino acid and the tRNA anticodon.

mRNA- CAU tRNA- GUA

Is it relevant to have free ribosomes and bound ribosome? Explain your response.

yes, free ribosomes make myofibrils that are inside muscle fibers. Bound ribosomes are attached to the rough endoplasmic reticulum.