Chapter 16
Hormones result in what type of signalling?
what is endocrine signalling
These cytoskeletal components are described as strong and rope-like
What are intermediate filaments
This has to happen before mitosis can occur
DNA replication (S phase)
Define homologous chromosomes
same genes, same order, different alleles
Aerophobia is a fear of what?
fear of flying
Acetylcholine binds to receptors on heart, skeletal muscle, and salivary gland cells. What responses are triggered in each cell?
heart-decreases rate
skeletal musc-contraction
salivary-secretion
Thin and flexible cytoskeletal components
actin filaments
Mitosis results in what?
two identical daughter cells
When does crossing over occur?
Prophase I
Ophidiophobia is defined as the fear of what?
fear of snakes
What determines if a cellular response is fast or slow?
whether the signal acts through existing intracellular molecules or requires gene expression
Microtubules do all of the following EXCEPT:
holding internal organelles such as the Golgi apparatus in particular positions in the cell
creating long, thin cytoplasmic extensions that protrude from one side of the cell
strengthening the plasma membrane
moving materials from one place to another inside a cell
separate chromosomes during mitosis.
strengthening the plasma membrane
What is prophase
Meiosis results in
four genetically unique haploid cells
Someone who has turphobia is afraid of what?
cheese
What happens when a GPCR activates a G-protein?
The alpha subunit exchanges GDP for GTP
microtubules
Put the stages of the cell cycle in the correct order.
interphase (G1, S, G2), prophase, prometaphase, metaphase, anaphase, telophase, cytokinesis
True or False: DNA replication occurs once before mitosis but twice before meiosis.
FALSE
Triskaidekaphobia is the fear of what?
fear of Friday the 13th
Positive feedback is described as this
A downstream protein in a signaling pathway acts to increase the activity of the protein that activated it.
Keratin is an example of this cytoskeletal protein.
Intermediate filament
Name the internal cell cycle checkpoints
G1/S
G2/M
mitotic spindle checkpoint
Name the 3 sources of genetic variability
Coulrophobia is the fear of what?
CLOWNS!