the answer is A. I took the test and got it right. The question is specifically asking about the THIN filaments, making it actin- and only actin.
Answer:
Monocots have only one seed leaf inside the seed coat. Dicots have two seed leaves inside the seed coat.
Explanation:
Monocots: Often only a thin lead, because the endosperm to feed the new plant is not inside the seed leaf.
Dicots: Usually rounded and fat, because they contain the endosperm to feed the embryo plant.
Answer:
The correct answer is A. Brief stressors lead to changes in cytokine production.
Explanation:
Cytokines form an important group of proteins that act as mediators of communication between living cells. They can exert their action in a paracrine way (between neighboring cells within the same tissue), or endocrine (between cells located in different tissues). The imbalance on the immune system that stressful events exert is an increase in the production of pro-inflammatory cytokines and their associated spectrum of age-related syndromes and diseases. Proinflammatory cytokines are soluble mediators that promote and mediate inflammatory processes, the following stand out: interleukin 1 (IL-1) is involved in the regulation of the immune process and inflammation; interleukin 6 (IL-6) that also serves as a link between the endocrine system and the immune system; and Tumor Necrosis Factor (TNF), which has the ability to destroy certain cell lines and initiate the cascade of pro-inflammatory cytokines and other mediators.
The answer would be 1. original-tissue fossils and 2. many species were wiped out
Carbohydrates are mainly transported in the phloem in the form of sucrose. The cell membrane of the sieve cells contains pump proteins that actively convey sucrose into the vascular pathways.
