Answer:
-20 items-
Bed
Cat
Dog
desk
water
stove
oven
chair
toilet
shirt
shampoo
shoes
backpack
food
socks
paper
pencil
table
mask
towel
If Plants no longer existed on earth then there would be no way for carbon dioxide to be converted into oxygen, without oxygen animals and humans alike would die. The Worlds "Air" would be toxic for us to breathe, we need plants to survive. Without plants, animals would die of starvation, and predators would as well without substance.
Answer:
RNA polymerase is an enzyme that is responsible for copying a DNA sequence into an RNA sequence, duyring the process of transcription.
Your answer can be found on quizlet, Brainly won’t let me comment the answer. Just copy+paste :)
Answer:
red blood cells or formed in the red bone marrow of bones
Answer:
The correct answer is 3: "<em>High levels of Ca2+ are expected to be found </em><em>within the sarcoplasmic reticulum</em>".
Explanation:
Muscular contraction is a highly regulated process that depends on free calcium concentration in the cytoplasm. Amounts of cytoplasmic calcium are regulated by <u>sarcoplasmic reticulum</u> that functions as a storage of the ion.
When a nerve impulse reaches the membrane of a muscle fiber, through acetylcholine release, the membrane depolarizes producing the entrance of calcium from <u>extracellular space</u>. The impulse is transmitted along the membrane to the sarcoplasmic reticulum, from where calcium is released. At this point, <em>tropomyosin is obstructing binding sites for myosin on the thin filament</em>. The calcium channel in the sarcoplasmic reticulum controls the ion release, that activates and regulates muscle contraction, by increasing its cytoplasmic levels. When <em>calcium binds to the troponin C</em>, <em>the troponin T alters the tropomyosin by moving it and then unblocks the binding sites,</em> making possible the formation of <em>cross-bridges between actin and myosin filaments.</em> When myosin binds to the uncovered actin-binding sites, ATP is transformed into ADP and inorganic phosphate.
Z-bands are then pulled toward each other, thus shortening the sarcomere and the I-band, and producing muscle fiber contraction.
