BIO105 Lecture, Chap. 3: Cells and Diffusion, Homework

Which cell organelle is described as being enclosed in a double membrane and being the powerhouse of the cell?

Mitochondria

TRUE OR FALSE? Diffusion is defined as substances moving from an area of low concentration to an area of high concentration.

False.

What is the amino acid sequence to the start codon and which protein does it code for?

AUG-Methionine

What is the function of the golgi apparatus?

it is the packaging center of the cell. it modifies, concentrates and packages proteins and lipids made in the RER and SER.

TRUE OR FLASE? DNA makes RNA, and RNA makes proteins.

True.

Which statement describes the events that take place during metaphase best?

Chromosomes line up at the metaphase plate

What is the function of the glycocalyx?

as specific biological markers for cell to cell recognition. it allows the immune system to recognize self vs foreign invader

TRUE OR FASLE? Active transport uses energy to move solutes against their concentration gradients

True.

If a red blood cell is placed in a hypertonic solution, what will happen?

The solution has higher osmolarity than the cell, so water flows out of the cell, resulting in crenation of the cell.

Tha plasma membrane is described as?

A selectively permeable phospholipid bilayer