1. Why are lysosomes important to health of cells? A. They break down worn-out cell parts that are no longer needed.

2. Which of the following organelles provide structure and rigidity to a plant cell?

B. Cell wall

3. What would happen to a plant if the chloroplast in it's cells became damaged?

A. The plant would not make glucose and oxygen

4. A cell sends messages to itself via .

B. Autocrine signalling

5. Which activity produces an action potential in nerve cells?

D. exchange of irons

There all correct trust me T_T​

Which statement about dna replication is true? a. eukaryotes only have one circular chromosome that unwinds at multiple locations. b. eukaryotes can only replicate one segment of a chromosome at a time. c. prokaryotes can only replicate their single circular chromosome in the nucleus. d. prokaryotes only have one origin of replication to initiate replication.

Humans are believed to have evolved in coastal regions in east africa. the region had an abundant supply of fish for early humanoids to eat. when scientists analyze the fads gene they see an interesting pattern. people whose families have lived in this area of east africa for generation show a high level of diversity in alleles for the fads gene. conversely, people whose families had migrated inland a moderate distance from sources of fish showed a much lower diversity for fads gene alleles. additionally, the fads alleles found in people whose family has lived inland for generation are almost all gene alleles which produce fads proteins with a high level of function and activity. how do anthropologists explain this?

Which statement best describes the relationship between an allele and a gene? question 1 a. an allele is a variation of a gene that can be expressed as a phenotype. b. an allele is the part of a gene that attaches to messenger rna molecules. c. an allele is a segment of a dna molecule that controls replication of a gene.