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Pachacha [2.7K]
3 years ago
13

The lysosome is an organelle that is important to cellular homeostasis through its degradation of different compounds. Degradati

ve enzymes responsible for reactions within the lysosome are most efficient at pH levels below what is found in the cell. What is responsible for allowing a different pH between an organelle and the rest of the cell?
Biology
1 answer:
DiKsa [7]3 years ago
8 0

Answer:

The presence of proton pumps in the lysosome membrane that allows the organelle to maintain higher concentrations of protons.

Explanation:

Lysosomes are known as a membrane-bound cell organelle that is present in many animal cells. They are spherical type vesicles in structure. Lysosomes contain hydrolytic enzymes these enzymes help in the break down of different kinds of biomolecules.

The lysosomal membrane helps to protect the cytosol, and rest of the cells, from the degradative enzymes which are present in the lysosome. They have the ability to maintains their pH by pumping in H+ ions (protons) from the cytosol across the membrane with the help of chloride ion channels and proton pumps.

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Put the steps of zygomycete sexual reproduction in the right order. Start with the production of multinucleate gametangia at the
Vesnalui [34]

Answer:

Choice 4 of 5. Hyphae produces multinucleate gametangia

Choice 1 of 5. Gametangia fuse

Choice 2 of 5. Karyogamy occurs and zygosporangium develops

Choice 5 of 5. A dark, thick-walled zygospore develops

Choice 3 of 5. Meiosis occurs to produce haploid spores

Explanation:

The steps of zygomycota sexual reproduction are;

Germination step; Hyphae produces multinucleate gametangia

Plasmogamy step; Gametangia fuse when compatible mating types of mycelia are brought close to each other by the formation gametangia between

The fusion of the nuclei results in the formation of zygosporangium that has multiple haploid nuclei and a thick wall

Karyogamy step; A zygote having multiple diploid nuclei is formed by the fusion of nuclei

Germination and Meiosis step; The sporangia grows and haploid spores are produced

Therefore, we have;

Choice 4 of 5. Hyphae produces multinucleate gametangia

Choice 1 of 5. Gametangia fuse

Choice 2 of 5. Karyogamy occurs and zygosporangium develops

Choice 5 of 5. A dark, thick-walled zygospore develops

Choice 3 of 5. Meiosis occurs to produce haploid spores

3 0
2 years ago
Sort the following events into two categories:________.
Amanda [17]

Answers:

a) carcinogenic

b) anti-carcinogenic

c) carcinogenic

d) carcinogenic

e) carcinogenic

f) anti-carcinogenic

g) anti-carcinogenic

h) anti-carcinogenic

Explanation:

Cyclins are proteins that regulate the progression through the cell cycle, i.e., the transition of G1 to S phase. It is well known that high cyclin expression may lead to cell proliferation states, which is closely associated with cancer progression. Moreover, the blockage of cyclins may have an anti-carcinogenic effect by inhibiting the progression through the cell cycle. MAP kinases are serine/threonine kinases that regulate the progression through the cell cycle by phosphorylating a variety of substrates during cell proliferation. In consequence, phosphatases that inactivate MAPK kinases (i.e., by dephosphorylation) may have an anticarcinogenic effect. The p53 is a tumor suppressor protein involved in diverse cellular processes including DNA repair, cycle arrest and programmed cell death. This protein (p53) is activated by phosphorylation at target residues and phosphatases inactivate it, thereby the blockage of its degradation may have an anticarcinogenic effect. Oncogene activation (i.e., the expression of oncogenes), may alter diverse cellular processes including DNA replication, and thereby may lead to cancer development. The G-protein α subunit is a GTPase that hydrolyses GTP and thus has a major role in controlling the kinetics of the G-protein signaling cascade. Platelet-derived growth factor receptors (PDGFR) are kinase receptors that play roles in regulating cellular differentiation, cell proliferation and cell growth. PDGFR receptors are present on the surface of normal cells, however, it has been shown that mutations of the PDGFR genes that lead to their high expression lead to uncontrolled cell growth and consequently cause cancer (i.e., by increasing PDGF signaling).

5 0
3 years ago
What disorder is caused by hypersecretion of cortisol from the adrenal cortex?
Assoli18 [71]
That would be Cushing's Syndrome, or Cushing's Disease. If the problem arises in the adrenal gland, then the disorder is primary adrenal insufficiency.
8 0
3 years ago
PLEASE HELP!! Identify a specific environmental factor that will cause a response to living things, and describe how this factor
jasenka [17]

Answer:

A specific environmental factor that will cause a response to living things will be light from the sun.

Explanation:

An enhanced amount of light from Sun will cause the plants to have enhanced photosynthesis. Photosynthesis can be described as a process by which plants use light energy from the sun to convert carbon dioxide and water into sugar (food) and oxygen.

In animals, enhanced amount of light from the sun will cause sweating and vasodilation.

The process of photosynthesis won't occur in animals and the process of sweating won't occur in plants.

7 0
3 years ago
In quiet breathing (A) inspiration is passive and expiration involves muscular contractions. (B) inspiration and expiration invo
Zolol [24]

Answer:

In quiet breathing inspiration involves muscular contractions and expiration is passive.

Explanation:

Respiration process involves two different stages, inspiration - inhalation- and expiration - exhalation-.

During inspiration, the diaphragm <u>contracts</u> and goes down, while intercostal muscles also <u>contract</u> and go up. These actions enhance the size of the thoracic box and <u>reduce internal pressure</u>. As a result, air flows in and fills the lungs.

During expiration, the <u>diaphragm relaxes</u> and the volume of the thoracic box diminishes, which causes the <u>pressure inside to increase</u>. In consequence, the lungs contract and the air is expulsed outside.  

8 0
3 years ago
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