El sarcolema, o membrana plasmática de una célula muscular, ayuda a mantener un gradiente de concentración de iones de calcio entre el citoplasma de la célula muscular y el líquido extracelular. Cuando una célula muscular recibe una señal para contraerse, el calcio (Ca+2) se mueve a favor de este gradiente y pasa del espacio extracelular hacia el citoplasma de la célula. ¿Cuál de los siguientes es el mecanismo más probable por el cual el Ca+2 atraviesa el sarcolema durante la contracción de la célula muscular? a. El Ca+2 fluye a través de acuaporinas
b. El Ca+2 pasa por canales proteicos de la membrana
c. El Ca+2 se transporta por proteinas periferales

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

During which phase does earth see more than half of the moon's surface? 1)first quarter2)third quarter3)waxing gibbous4)waning crescent

Will mark brainliest i only need the ! 1.use ten beads and a centromere of one color to construct the long chromosome. use ten beads and a centromere of a second color to construct the second chromosome in the long pair. make a drawing of the chromosomes in the space below. 2. for the second pair of chromosomes, use only five beads. 3. now model the replication of the chromosomes. make a drawing of your model in the space below. part b: meiosis i during meiosis i, the cell divides into two diploid daughter cells. 4. pair up the chromosomes to form tetrads. use the longer tetrad to model crossing-over. make a drawing of the tetrads in the space below. 5. line up the tetrads across the center of your “cell.” then model what happens to the chromosomes during anaphase i. 6. divide the cell into two daughter cells. use the space below to make a drawing of the result. part c: meiosis ii during meiosis ii, the daughter cells divide again. 7. line up the chromosomes at the center of the first cell, one above the other. separate the chromatids in each chromosome and move them to opposite sides of the cell. 8. repeat step 7 for the second cell. 9. divide each cell into two daughter cells. use the space below to make a drawing of the four haploid cells